a piece of equipment, used especially in the past, for directing all the phone calls made to and from a particular building or area电话总机,电话交换台
Tearful fans jammed the radio station's switchboard after the singer's death (= so many people called that all the phones were busy).歌手去世之后,伤心哭泣的歌迷纷纷打电话到电台,使总机忙得不可开交。
Ask the switchboard operator for the extension number you require.让总机把你转到你要找的分机号。